Uncaught TypeError: Cannot read property 'props' of null

Hey, I migrated from `3.5.1` to `4.3.1` and I am having error:

`Uncaught TypeError: Cannot read property 'props' of null`

Some of my Columns might be null in some cases and I think this is the issue. Error fires at BootstrapTable.js:
```
// If columns changed, clean removed columns that had filters
if (props.children !== this.props.children && this.filter) {
var nextDataFields = _react2.default.Children.map(props.children, function (column) {
return column.props.dataField;
});
_react2.default.Children.forEach(this.props.children, function (column) {
var _column$props = column.props,
dataField = _column$props.dataField,
filter = _column$props.filter;

if (filter && !nextDataFields.includes(dataField)) {
// Clear filter
_this2.filter.handleFilter(dataField, '', filter.type, filter);
}
});
}

```